Carbon dioxide induced separation of ionic liquids and water

Abstract

Both hydrophobic and hydrophilic room-temperature ionic liquids can be separated from aqueous solutions with relatively low-pressure gaseous carbon dioxide.

Ionic Liquids Recycling for Reuse

“…But, their preliminary results using scCO 2 as extraction solvent do not seem to have better expected extraction properties. Scurto et al (2003) studied CO 2 induced separation of IL and water. If a pressure of CO 2 is placed upon a mixture of the IL and water, a second liquid phase can appear.…”

“…4, the densest liquid is rich in IL (L 1 ), the next phase is rich in water (L 2 ) and the third phase is vapor (V), which is mostly CO 2 with a small amount of dissolved water. Scurto et al(2003) Recycling of ILs with high efficiency is of key importance on going from the laboratory-scale to large-scale industrial application of these solvents [Wu et al, 2009]. It is noteworthy that the efficiency of the recycling process for various ILs varies from quite poor ] to very good [Welton, et al, 2000;Handy & Zhang, 2001;Fukuyama et al, 2002].…”

“…4. Phase behaviour of IL/water/CO 2 mixture at increasing pressure at near-ambient temperatures (Adapted from Scurto et al, 2003) Several procedures for the recycling of ILs have been reported in the literature. Depending on the IL used and the application where it is used, a variety of methods for recycling are possible.…”

Role of 1-methyl-3-octylimidazolium chloride in the micellization behavior of amphiphilic drug amitriptyline hydrochloride

“…They possess significant promise in miscellaneous industrial applications, where high surface areas, modification of the interfacial activity or stability of colloidal systems are required. The low volatility, non-flammability, wide electrochemical window, high thermal stability, and wide liquid range [1][2][3][4] are unique properties of these salts that are applied for catalysis [5], electrochemistry [6], chemical separation [7][8][9] and as a novel solvent in organic synthesis [10,11].…”

Preparation of MCM-41 silica using the cationic surfactant blend

“…The air and moisture stable room-temperature ionic liquids (RTIL) have currently received considerable attention as novel media for chemical synthesis (Wasserscheid and Welton 2003), homogeneous catalysis (Gordon 2001), electrochemistry (Lagrost et al 2003), and separation techniques (Scurto et al 2003). Their unique properties offer a great potential for many applications as nonvolatile, nonflammable, environmentally benign alternatives to conventional organic solvents (Welton 1999;Wasserscheid and Keim 2000;Miskolczy et al 2004).…”